Mechanical Technical Questions

1) Cavitation occurs due to A) High velocity B) Low Barometric Pressure C) High Pressure D) Low pressure E) None of these 2) The velocity of fluid particle at the centre of the pipe section is A) Maximum B) Minimum C) Average D) R.M.S E) None of these 3) During throttling process A) Internal energy does not change B) Pressure does not change C) Entropy does not change D) Enthalpy does not change E) None of these 4) In an automobile gear box is fitted between A) Engine and clutch B) Clutch and Differential C) Differential and heels D) Clutch and Wheels E) None of these 5) During an adiabatic process the change in entropy is A) + ve B) –ve C) Zero D) +ve or –ve E) None of these 6) Volume of air at 27°C is 2 cu-m. What will de the volume at 372°C A) 2 cu-m B) 3 cu-m C) 6 cu-m D) 8 cu-m E) None of these 7) Air conditioning means A) Cooling B) Heating

C) Dehumidifying

D) All the above E) None of the above

8) Brazing is the process of joining A) Two ferrous materials B) One ferrous and one non ferrous material C) Two Non ferrous materials D) Two non-metals E) None of these 9) Second Law of Thermo dynamics defines ……………… A) Heat B) Work C) Enthalpy D) Entropy E) None of the above 10) Acoustic materials A) Absorb sound B) Reflect sound C) Create sound D) Absorb & create sound E) None of these 11) The basic shaft is A) One which has no upper deviation B) One which has no lower deviation C) One which has least deviation on both upper and lower side D) Does not exits E) None of these 12) The standard angle between the V belt is A) 20° B) 30° C) 45° D) 40° E) None of the above 13) The purpose of annealing A) Induce Hardening B) Induce stress of these

C) Harden the surface

D) Remove Stress E) None

14) The tool signature comprises A) 5 elements B) 6 elements C) 7 elements D) 8 elements E) None of these

15) A shim is A) A treatment given to a surface to prevent rusting B) A dull corner on a shaft C) A thin piece of sheet metal used between mating parts to provide the proper distance D) A surface on which bearings are fitted E) None of these 16) Spot facing is A) Localized machining of a component B) Machining of a spot to fit other arts C) Machining of spot on the surface of a part to furnish a flat bearing or the head of a bolt or nut D) A spot prepared on shaper or milling machine E) None of these 17) Quill is A) A tool used in milling machine to cut T-slots B) A holding device used on planers C) Cutting a blind key way on an object D) A steel tube in the head of some machine tools that encloses the bearings and rotating spindle on which are mounted the cutting tools E) None of these 18) Which of the following materials will have highest value of contraction allowance? A) Cast iron B) Aluminium C) Brass D) Malleable iron E) None of these 19) In hot blast cupola A) Temperature is high B) Melting rate is high C) Carbon % in castings is high D) Air supplied is preheated E) None of these 20) Which one of the following is used for Thermocouple junctions? A) Elinvar B) Manganin C) Nichrome D) Muntz metal E) None of these 21) In a sine bar the standard length is measured from A) Edge to edge B) Between inner circumferences of two buttons C) Between outer circumferences of two buttons D) Between the centers of two buttons E) Any of the above. 22) The surface roughness on a drawing is represented by A) Circle B) Square C) Zigzag lines D) Triangle E) none of these 23) A sine bar is used to measure A) Surface roughness B) Gear Profiles C) Internal tapers D) External tapers E) Any of these 24) M 10 screws have a pitch of A) 0.5 mm B) 1.25mm C) 1.5mm D) 10mm E) None of these 25) A diffuser A) Converts kinetic energy into thermal energy B) Converts potential energy into kinetic energy C) Converts pressure energy into kinetic energy D) Converts thermal energy into kinetic energy E) None of these 26) A substance above critical temperature exists as A) Solid B) Liquid C) Dry vapour D) Wet vapour E) Gas

27) Working medium for closed cycle gas turbine should have A) High molecular weight B) Low specific volume C) Higher adiabatic index D) Lower specific speed E) None of the above 28) In a cupola the raw material is A) Pig iron and iron scrap B) Iron ore C) Cast steel D) Steel ingots E) Steel billets 29) Surging is A) An unsteady, periodic and reversal of flow in the compressor. B) The fixed mass flow rate regardless of pressure ratio C) The reduction in lift force at higher angles of incidence D) None of these E) All the above 30) Ice is slippery when a man walks on it for A) Its surface is smooth B) There is no friction C) It is very chill D) Increase of pressure causes it to melt E) It has lubricating capacity 31) In case of black body A) =1, =0, =0

=0, =0, =1 B)

=0, =1, =1 C)

=0, =1, =0 D)

=1, =1, =0 E)

32) A hot wire anemometer is used to measure Pressure of gases. 33) The operation of cutting multiple holes is called A) Trimming B) Notching C) Perforating D) Lancing E) None of the above 34) A twist drill is specified by A) The size of hole it can drill B) A number specifying whole size C) A letter of alphabet D) Any of the above E) None of the above 35) Dry bulb temperature depends on A) Humidity of air B) Water vapour content of air C) Condition of air D) All above E) None of the above 36) The potential energy stored up in a deformed body is known as A) Strain energy B) Potential energy C) Resilience D) Deformation energy E) None of the above 37) Idler pulley is used for A) Maintaining belt tension B) Changing direction of rotation C) For stopping motion frequently D) For running during idling periods only E) None of the above 38) Continuous chips may be formed while machining A) Brittle material B) Hard material C) Tough material D) Ductile material E) None of the above 39) The output of blast furnace A) Cast steel B) Mild steel C) Pig iron D) Cast iron E) None of the above 40) An ordinary mercury thermometer can be used for temperature about A) 100°C B) 200°C C) 400°C D) 500°C E) None of the above

41. A stone initially at rest is dropped from the edge of a very tall building. Taking acceleration as 10m/s2, what was the change in the speed of the stone during the 4th second? a. 10m/s b. 30m/s c. 15m/s d. 40m/s e. None of the above 42. Which of the following methods in welding uses a pool of molten metal? a. Carbon arc welding b. TIG welding c. Submerged arc welding d. MIG welding e. Thermit welding 43. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base is __________ than that passing through its C.G. and parallel to the base. a. Nine times b. six times c. four times d. one-half e. one-third 44. A hydrometer is used to measure a. velocity of fluids b. velocity of gases c. flow of fluids d. specific gravity of fluids e. none of these 45. A taper provided on the pattern for its easy and clean withdrawal from the mould is known as A. machining allowance B. draft allowance c. shrinkage allowance d. distortion allowance e. None of the above 46. How many of the following statements may be false? 1. Weight is a scalar quantity. 2. Parallelogram law of forces is applicable for finding the resultant of all kinds of forces. 3. Law of conservation of momentum is developed from Newton’s third law. 4. The unit of impulse is Newton/second. 5. The frictional force depends on shape and area of contact of the bodies. a. One only b. Two only c. Three only d. Four only e. All of the above 47. The standard dimensions of the drawing sheet A2 is a. 594x420 mm b. 420x297 mm c. 841x594 mm d. 297x210 mm e. None of the above 48. ISO stands for International Standards Organisation. 49. The branch of science that deals with study of body in motion, considering the forces that causes the motion is known as a. Dynamics b. Statics c. Kinematics d. Kinetics e. None of these 50. Second law of thermodynamics define a. internal energy b. entropy c. enthalpy d. temperature e. none 51. Which mechanical property a metal should possess to enable it to be mechanically formed? a. ductility b. malleability c. elasticity e. machinability e. None of the above 52. The pH value of water is a. 3 b. 5 c. 7 d.9 e.None. 53. Which of the following refers to investment casting? a. lost wax method b. accuracy casting c. centrifugal casting d. both (a) and (b) e. both (a) and (c)

54. The angle of projection shown in the figures A and B respectively are A)

B)

a. First angle and third angle b. Third angle and first angle c. Third angle and fourth angle d. Fourth angle and third angle e. None of the above 55. The ratio of volumes of a sphere and a cone is a. 4r/h b. 4r/3h c. 2r/h d. 3

e. None

56. In green-sand moulding, uniform ramming leads to a. less change of gas porosity b. uniform flow of molten metal into the mould cavity c. greater dimensional stability of the casting d. less sand expansion type of casting defects e. None of the above 57. Which one of the following processes in welding uses non-consumable electrodes? a. TIG welding b. MIG welding c. Manual arc welding d. Submerged arc welding e. None of the above 58. The properties of LASER are high coherence, unidirectional, Monochromatic, Long distance propagation 59. The unit of moment of inertia is a. Kg/m2 b. Kg-m2 c. Kg/m

d. Kg-m

60. Disposable patterns are made of a. wood b. rubber c. metal

d. polystyrene

61. Ball bearing material? a. chromium b. high carbon steel

c. medium carbon steel

e. None

e. all the above

d. low carbon steel

62. Necking? a. drill a hole in a plate b. groove is a cylinder c. initially making a spot to join the metal d. drill with rivet 63. Size of lathe specified by a. Gross wt b. chuck dia c. swing d. speed of chuck 64. Power transmitted from lead screw to carriage through a. half nut b. rack and pinion c. gear box d. pulley

65. Left hand tool of lathe - ? Ans: Feed from Head stock to tail stock 66. Using HSS tool in lathe, max speed will be given in a. cast iron b. mild steel c. aluminium 67. In which operation in lathe, cutting speed will be minimum for a. parting off b. taper turning c. finishing d. thread cutting 68. Gratings are used in connection with a. linear displacement measurement c. angular measurement

b. surface texture measurement

69. At what position, strain will increase, when stress is constant a. upper yield point b. lower yield point c. proportional limit d. elastic limit 70. shape of bending moment, it shows when we applied no external load, a. linear b. curve d. parabolic 71. Relationship between E, k, G? Ans: E= 9KG / (3K+G) 72. Mechanism used in petrol engine? a. slider mechanism b. crank mechanism c. slider crank mechanism 73. 18/8 steel contains a. 18% Ni ,8% Cr b. 18% Cr ,8% Ni

c. 18% Vd ,8% Ni

d. none of these

74. Sulphur is removed from cast-iron when same is melt in cupola the flux is --? 75. Plaster pattern & cores are made up of a. plaster of paris b. cement c. white powder 76. Pilot tube is used to measure velocity. 77. Darry weisbach formula usage? Ans: Hf = (4f l v 2)/ (2 g d) 78. Velocity distribution for laminar flow in circular pipe? Ans: Parabolic 79. If resultant, R=0, body a. rotate with uniform accl.

b. Rotate with uniform disp. c. Does not rotate d. Rotate

80. Shock load measures energy. 81. Carbon steel is an alloy of iron and carbon with varying quantities of ………..? Phosphorous & sulphur 82. Varigon’s theorem - Algebraic sum of moments of a given set of forces about a point is equal to the moment of their resultant. 83. Compound mechanism is with more than

a. 2 links

b. 3 links

c. 1 link

84. Type of governor used in record player for adjusting the turn table is a. hartung governor b. Pickering governor c. proell governor d. porter governor 85. Pantograph, all pairs are a. sliding b. turning

c. spherical

d. self closed pair

86. Belt drive is a. positive b. not positive c. for small torque only d. power transmission for parallel axis only 87. Quasi static process, definition 88. Total energy line represents? 89. If mass/energy transfer is zero, then what system? Ans: Isolated system 90. Which cycle is less efficient? 91. What chuck is used for brass castings? a. 4 jaw b. 3 jaw c. collet d. magnetic 92. Which is most important for measuring instrument? a. precision b. sensitiveness c. accuracy d. repeatability 93. Purpose of tolerance a. for perfect fit b. can’t machine exact size c. allowance. 94. According to Boyle’s law for a perfect gas a.T2/T1=P2/P1,if V is kept constant b.T2/T1=V2/V1,if P is kept constant Both (a) and (b) above. P2/P1=V1/V2, if T is kept constant PV/T constant 95. Absolute Zero pressure will occur a. At sea level b. At the centre of the earth c. When molecular momentum of the system become zero d. Under vaccum condition e. At a temperature of -273 degree k 96. Boyle’s law i.e. PV=constant is applicable to gases under a. All ranges of pressure b. Only small range of pressure c. High range of pressure d. Steady change of pressure e. Atmospheric conditions 97. The Internal energy of a system is a function of only a. Pressure b. Temperature (absolute) c. Volume d. Pressure and temperature e. Pressure and temperature and volume 98. Pick up the wrong statement a. 2-stroke engine can be run in any direction b. In 4-stroke engine a power stroke is obtained in 4strokes c. Thermal efficiency of 4-stroke engine is more due to positive scavenging d. Petrol engines works on otto cycle e. Petrol engines occupy more space than diesel engines for same power output 99. Diesel fuel, compare to petrol is a. Less difficult to ignite b. Just about the same to ignite c. More difficult to ignite d. Highly ignitable e. None of the above

100. The function of a condenser in thermal power plant is to condense steam into condensate to be reused again 101. In diesel engine, the compression ratio in comparison to expansion ratio is a. Same b. Less c. More d. Variable e. More / Less depending on engine capacity 102. Flash point of fuel is Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame 103. The function of piston rod in IC engine is to a. Transfer motion from piston to cross head b. Transfer motion from piston to connecting rod c. Provide reciprocating motion to slide valve d. Convert reciprocating motion of piston to rotary motion e. To control cut off point 104. Electroplating requires? (1) AC

2) DC

3) high frequency ac

105. Carnot cycle has max efficiency for reversible engine 106. Fuel-air ratio in a petrol engine fitted with suction carburetor, operating with dirty air filter as compared to clean filter will be? Higher 107. In S.I engines, air fuel ratio for idling speed is? 108. Helical gears are used for noise reduction. 109. Hardest cutting tool material is tungsten carbide. 110. for uniform strength of beam condition req. a. Depth constant, width increases. b. Depth increases, width decreases. c. Both should be increases. d. All the above. e. None of the above 111. Phenomenon of chocking in compressor means a. No flow of air b. Fixed mass flow rate regardless of pressure ratio c. Reducing mass flow rate with increase in pressure ratio d. Increased inclination of chord with air stream e. Does not occur 112. A jet engine works on the principle of conservation of a. Mass b. Energy c. Flor d. Linear momentum e. Angular momentum 113. The domestic refrigerator uses following type of compressor a. Centrifugal b. Axial c. Miniature sealed unit d. Piston type of reciprocating e. None of the above 114. Ammonia is Toxic and non-inflammable 115. If operating temperature of system is low, then refrigerant with low boiling point should be used 116. Poise to the unit of Viscosity

117. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support .The spring balance reading will a. Increase b. Decrease c. Remain same d. Increase / decrease depending on depth of immersion e. Unpredictable. 118. Liquids transmit pressure equally in all directions. This is according to a. Boyle’s law b. Archimedes principle c. Pascal’s law d. Newton’s formula e. Chezy’s equation 119. Piezometer is used to measure a. Pressure in pipes, channels etc. b. Atmospheric pressure c. Very low pressure d. Difference of pressure between two points e. Flow 120. The centre of gravity of a triangle lies at the point of a. concurrence of the medians b. Intersection of its altitudes c. Intersection of bisector of angles d. Intersection of diagonals e. All of the above 121. A ball is throwing up. The sum of kinetic and potential energies will be maximum at a. Ground b. Highest point c. In the centre while going up d. At all the points e. In the centre while coming down 122. The atmosphere of earth is retained due to a. Gravitational pull of earth b. Outer molecule attraction forces on the molecule c. As a result of cohesion, adhesion, osmosis, etc. d. Spherical shape of earth e. Mean speed of molecule being much less than the escape velocity 123. According to Hooke’s law, stress and strain a. Are directly proportional b. Are inversely proportional c. Are curvilineraly related d. Have unpredictable relationship e. None of the above 124. In an ideal machine, the output as compared to input is a. Less b. More c. equal d. May be less or more depending on efficiency

e. Always equal

125. Creep in belt is due to a. Material of the pulley b. Material of the belt c. Larger size of the driver pulley d. Uneven extensions and contractions due to varying tension e. Expansion of belt 126. The horse power transmitted by a belt is depending upon a. Tension on tight side of belt b. Tension on slack side of belt c. Speed of pulley d. All of the above 127. Melting point of iron is a. 1539°C b. 1601 °C c. 1489 °C d. 1712 °C e. 1131 °C 128. Cupola produces following Material a. Cast iron b. Pig iron c. Wrought iron d. Malleable iron e. White iron 129. Brass Contains 70% copper and 30% zinc

130. In which type of Welding chemical reaction takes place a. Resistance b. Termite c. Forge d. Gas 131. Resistance to fatigue strength is measured by a. Tensile Test b. Shear Test c. Endurance Limit 132. A fly wheel starts from rest and accelerates uniformly and reaches 25 rpm in 3 seconds. What will be the angular velocity (in rpm) after 10 seconds? a. 20 b. 25 c. 45 d. 50 133. Radio active materials emits a. Alpha b. Beta c. Gamma d. All the above 134. Expansion valves are used in pipes carrying a. Water b. Steam c. Viscous fluid d. Air at high pressure 135. ON/OFF Control application Valve a. Ball valve b. Globe valve c. Needle valve d. Butter fly valve. 136. Thermal Conductivity of Solids with increase of temp a. Increases b. Decrease c. Increases then Decrease d. Unpredictable 137. Idling mixture in Petrol Engines a. Rich b. Lean c. Variable 138. Radiator is made up of a. Brass b. Steel c. Plastic d. Cast Iron 139. Hysterises loss is least affected by a. Temperature b. Frequency c. Weight d. Density 140. Compiler is used for A. High level to the Language understandable by machines B. To convert the programmes from Digital to Analog form C. To compile the instructions in registers D. Both B & C 141. Heat treatment of steel changes a. Physical b. Chemical c. Mechanical properties 142. Fusible plug is used for a. To control Steam Temperature b. To put off the fire when the water level in the boiler falls below the alarming limit c. To avoid Explosion. 143. Effect of Cavitation in Turbines a. Noise and Vibration b. Efficiency c. Decrease in life of blades d. All the above. 144. The correct relation between Gauge pressures, Absolute pressure, Atmospheric pressure (4 choices) 145. Which of the following has the maximum Head? a. 33 inches Hg b. 756 mm of Hg c. 31.6 m of water (Not clear) d. 1.013 kg/sq.cm

146. Manometer is effective for a. High pressure b. Very High pressure c. Low pressure d. None of the above 147. Elasticity of a fluid is measured by a. Modulus of Elasticity b. Rigidity Modulus c. Bulk Modulus d. None of the above 148. Where the bending stress is maximum for I Section Beam a. Neutral axis b. At the joint of wedge and flank c. where the shear stress is maximum d. Outer most of the fibres 149. The oil of sp. gravity 0.9 and water are kept in two identical vessels, Hydro static Pressure at bottom of oil will be a. More than pressure of the water at the bottom b. Less than pressure of the water at the top c. Same d. Insufficient data 150. Cp / Cv of Gas at varying temperatures a. Constant b.Increases c. Decreases(With some conditions) 151. Compression ratio of the C.I. Engine a. 8 to 10 b. 10 to 15 c. 16 to 20 d. None 152. The sate of the refrigerant in the vapour compression cycle before throttling a. Wet b. Dry 153. Feuler gauges are used to Measure the clearance 154. High moisture content in the last stage of turbine will cause a. Corrosion b. Low thermal efficiency c. Low Blade life d. All the above 155. What alloying material imparts corrosive resistance properties of steel

a. Ni-Cr b. V,Cr c. Cr

156. Chip breakers are used for a. To permit small chips b. to increase tool life c. Safety 157. Jigs are used for a. Turning b. Milling c. Drilling d. Grinding 158. In coal refineries magnets are used to separate a. Dust b. Iron particles c. Sand d. All the above 159. Statistical processing is done for a. Improve the quality b. maintain the quality c. both 1 and 2 d. to increase the profit 160. What will happen to the specific volume of the water when it is heated from 0 degree c a. Increases b. Decreases c. Remain Constant 161. Reason for slipping when we walk on the Ice a. Ice suface is smooth b. When we apply pressure on the Ice it gets melted

162. When the Ice cubes present in the glass of water get melted what will happen to the level of water a. Increases b. Decreases c. Doesn't change 163. First law of Thermodynamics deals with a. Conservation of Mass b. Conservation of Momentum c. Conservation of Energy d. Conservation of Heat 164. Tonnage of 165 domestic refrigerators 165. Thermal Conductivity of Water with increase in temp a. Increases with temp b. Decreases then increases c. Increases then Decreases d. Does not change 166. Purpose of conducting Tensile Test - Ductility 167. Which structure can be viewed by Naked Eye? a. Micro Structure b. Grain c. Macro d. Atomic 168. What is the material of Crank Shaft? Forged Steel or Less Carbon Steel 169. Standard time = a. normal time minus allowance

b. reliability time

170. Energy stored in the spring when it is fully compressed without any deformation is Strain Energy 171. For which of the following material machinability is high?

Aluminium

172. 24 & 2 in M24X2 represent which of the two parameters respectively? Diameter and Pitch 173. What is the equation governing kinematics links and pairs? a. L=2p-3 b. L=2p-4 c. L=3p-5 174. Pick out the wrong statement a. Joule cycle consists of 2 constant volume processes and 2 adiabatic processes b. Otto cycle consists of 2 constant volume processes and 2 adiabatic processes c. Ericsson cycle consists of 2 constant volume processes and 2 adiabatic processes d. None of the above 175. For same compression ratio which of the following cycle is more efficient? a. Otto b. diesel c. Dual Cycle d. All the above. 176. The angle between face of the tool and plane parallel to the base of the tool is a. rake angle b. clearance angle c. cutting edge angle d. lip angle 177. Bevel gears are used for transmitting torque between a. Intersecting & coplanar shafts b. Non-intersecting & non-coplanar shafts c. Non-parallel & non-coplanar shafts d. None of the above 178. Expansion process in Otto cycle lasts from TDC to BDC.

179. Which type of thread is more effective for power transmission in one direction? a. Square b. ACME c. Buttress d. Trapezoidal 180. The state of a liquid during evaporation is a. Vapour b. Steam c. Water vapour d. None of the above 181. Throttle valve is used in steam engines to a. control pressure of steam b. control volume of steam c. control temperature of steam d. none of the above 182. The pressure P in terms of its mean kinetic energy/unit volume E is a .E/3 b.E/2 c.3E/4 d.2E/3 e.5E/4 183. Convert volumetric to gravitational, relative volume of each constituent of flue gas a. %mw b. xmv c. me d. xsw e. %sw 184. Which is correct for reversible polytrophic process? a. temperature constant b. density constant c. volume constant d. entropy constant e. same heat transfer 185. If a gas or vapour allowed to expand through a minute hole a. free expansion b. hyperbolic c. adiabatic expansion d. parabolic

e. throttling

186. Minimum work of compressor is possible, when the adiabatic index is a.0.75 b.1 c.1.27 d.1.35 e.2 187. Under ideal condition, isothermal, isochoric, adiabatic and isobaric are a. Static b. dynamic c. quasi-static d. stable e. thermodynamic 188. If a heat engine attains 100% efficiency, then it is a. Zeroth law b. I law c. II law d. no

e. all

189. If Q1 is the heat in source, Q2 is the cold sink for heat pump then COP a. Q1 / (Q1- Q2) b. Q2 / (Q1- Q2) c. (Q1- Q2) / Q1 d. Q2 / Q1 190. The output of diesel engine is increased if a. more fuel b. flywheel size c. incoming air

d. scavenging e. supercharging

191. Key used between shaft and pulley is made from? Cold rolled mild steel bars 192. Hardness of steel depends on shape & distribution of ….in iron? Carbides 193. Hardening of Machine tool guideways is done by? Flame hardening 194. Carriage and tailstock are placed in ….. guideways? Different 195. Acetylene is stored in liquid form 196. Size of shaper is specified by? Length of stroke

197. Hardness of wheel (or) grade of wheel refers to? Strength of bond of wheel 198. For grinding harder materials…… is used? Softer grade 199. Dielectric medium in EDM is? Kerosene 200. The most popular firing sequence a.1234 b.1324 c.1423

d.1243

e.1342

201. Accumulation of carbon in the cylinder increases when a. decrease in volume b. volumetric efficiency c. ignition time d. effective compression ratio e. travel time 202. For same power, same speed, flywheel of petrol and diesel engine are a. smaller b. greater c. equal d. none 203. If petrol is used in diesel engine, then which will occur a. higher knocking b. black smoke c. More fuel Consumption d. improper combustion 204. Reciprocating compressor is used for a. large quantity of air at high pressure b. large quantity of air at low pressure c. low quantity of air at low pressure d . Low quantity of air at high pressure 205. Thermal diffusivity is ____________ a. Dimensionless b. Used in radiation d. Used in Conduction

c. used in Convection

206. When the Centre of pressure and Centre of gravity are equal? When the body is horizontal 207. Flow of particles in definite path without change in the path of the particle a. One dimensional b. laminar c. turbulent d. steady state 208. Vortex on whirlpool is due to a. cavitation b. wake c. drag 209. Sling Psychometer is used for Humidity 210. Axial flow pump is used large flow and small head of fluid 211. Hardening of shear face in press tool is to ---------------. 212. Blank size is equal to ……….in presswork. Size of punch 213. Bending moment diagram for a UDL in cantilever beam. a. Parabola b. Triangle c. Rectangle. 214. Reverse joule cycle is ………. (Bell coalman cycle, Rankine cycle, brayton cycle)

215. During idling and low speed running which mixture is used……..rich mixture, lean mixture, 216. Multi slurry is used for …………? High efficiency, balancing and uniform torque, run continuously when one cylinder is failed. 217. Entropy changes with ……? a. internal energy change, b. Pr & Vol change

c. change of state

d. Change in temp

218. In which process max work can be obtained….? Const Volume, Const Pr, Const Temp, Const Entropy 219. In throttling process………is constant? (Enthalpy, entropy) 220. To avoid caviation Superheated steam allowed 222. What is Rupture Necking due to prolonged creep 223. A belt drive, where pulley dia is double, and then it key length must be a. doubled b. same c. increase the critical length d. 224. Surface contact in motion is called a. roller pair b. surface pair c. lower pair d. sliding pair 225. For fluctuating load----------- is used a. ball bearing b. roll bearing c. thrust bearing

d. sleeve bearing

226. D1 and D2 are pulley dia, and then the speed ratio is given by D2/D1 227. In pinion and gear design, the design must be made by a. gear b. pinion c. both 228. The plate is severely deformed at a side then it grains becomes a. Ductile b. Malleable c. Brittle 229. What is recrystallation temperature? Maximum temperature upto which old crystal disappears 230. What is austempering? Heated steel is quenched from the Austenizing Temperature 231. Acetylene is stored in --------- form a. liquid b. solid c. compressed d. All the above 232. Tool life is concentrated on a. cutting speed b. material c. feed or depth

d. All the above

233. Reamer is used for a. To drill b. to correct the size and finish

c. Threading

234. Statistical quality control charts uses a. statistics b. probability c. all the above.

235. Material used for coating the electrode is called a) Protective layer b) binder c) slag d) deoxidizer e) flux 236. The strength of a properly welded joint as compared to base metal a) Same b) more c) less d) unpredictable e) two can’t be compared 237. The surface to be machined are marked on the pattern by the following color a) Black b) yellow c) red d) blue e) green 238. A 20 tonne press implies that a) Weight of press is 20 tonnes b) press can handle works weighing upto 20 tonnes c) it can exert pressure upto 20 tonnes d) its foundation should be designed for 20 tonnes. e) its turnover in a day is 20 tonnes 239. No lubricant is required when cutting threads in a) Tungsten carbide b) Mild Steel c) Titanium

d) Brass or cast-iron e) HSS

240. The difference between planner and shaper is that in former case a) Tool moves over stationary work b) tool moves over reciprocating work c) Tool can machine internal as well as external details d) both tool and job reciprocates e) Tool is stationary and job reciprocates 241. Powder metallurgy techniques are used in production of a) High carbon tool steel b) HSS tools c) tungsten carbide tools

d) twist drills

242. Drilling is an example of a) Simple cutting b) uniform cutting e) Intermittent cutting

c) orthogonal cutting

243. Reamer is used to correct the a) Size and position of drilled hole. c) Finish and position of drilled hole. e) Finish and depth of a drilled hole.

b) size and roundness of hole d) finish and size of drilled hole

e) ceramics

d) oblique cutting

244. The operation of milling two sides of a work piece simultaneously is called a) Gang milling b) climb milling c) square milling d) straddle milling e) End milling 245. In which type of milling operation the chip is cut off at thinnest place and the chip thickness increases along chip length a) Up milling b) down milling c) end milling d) climb milling e) key way milling 246. A sine bar is specified by a) Its total length b) the center distance between two rollers c) size of the rollers d) The distance between rollers and upper surface e) weight of sine bar 247. Expressing a dimension as 18.3±0.02 mm is the case of a) Unilateral tolerance b) bilateral tolerance c) limiting dimensions d) All the above e) none of the above

248. LASER stands for Light amplification by simulated emission of radiation 249. Gantt chart provides the information about a) Material handling b) proper utilization of manpower d) Efficient working of machine e) all the above

c) production schedule

250. Normalising operation is carried out in a) Furnace b) air c) water d) oil e) controlled atmosphere 251. Draw the Fillet welding symbol 252. Who is the father of scientific management? F.W.Taylor 253. PERT stands for Projection Evaluation and Review Technique 254. Draw Third angle projection symbol 255. What is the unit of specific gravity? No Unit. 256. Momentum is a _______________ quantity (Scalar / Vector) 257. Pressure applied in a liquid in all directions will be given by Pascal’s law. 258. In Piercing and punching, clearance will be applied on Punch 259. Permanent plastic deformation of metals under compression is known as Malleability 260. To increase corrosion resistance which material will be added? Chromium 261. Cycle used in petrol engine? Otto 262. What is the use of index pulley? To provide grip to the pulley. 263. What is resilience? Energy absorbed by the material when it is loaded. 264. M20*2 –in this 20 represents what? Major Dia 265. Property of which type of material is same in all directions? Isotropic of materials 266. Solder is an alloy consisting of Tin & Copper 267. In a cantilever beam when a point load is applied on free end, where will failure occur? At the fixed end. 268. Plastic deformation due to constant load at high temp is known as Creep. 269. What is Galvanizing? The process of coating of zinc by hot dipping. 270. ABC analysis deals with Controlling inventory costs money.

271. When pulley dia is doubled, width is kept constant, tension is kept constant key size should be a. Doubled in length. b. Doubled in depth. c. Both twice. 272. Thermoplastics can be molded by Injection molding 273. Which load is safe for beam---------------? a. Point load. b. UDL locally. c. UDL fully.

d. UVL.

274. Machine tool drives are generally given in: a. Arithmetic progression b. Geometric progression c. Harmonic progression d. None of the above 275. Finite element analysis is used in: a. Accurate measurement b. Stress analysis C. metallurgy D. none of the above 276. Coolant is generally not used while machining: A. low carbon steel B. high carbon steel C. cast iron D. alloy steel 277. Machinability of steel is improved by the presence of: A. nickel B. tungsten C. sulphur D. chromium 278. Negative rake angle: A. increases cutting force B. reduces cutting force C. no effect on cutting force D. none of the above 279. The hardest tool material used is: A. coated carbide B. high speed steel C. boron nitride D. diamond 280. Stick slip phenomena is associated with A. spindle rotation B. belt drives C. slide movement D. none of the above 281. Gear hobbing is: A. shaping process B. generating process C. forming process 282. Cutting speed of HSS tools while cutting low carbon steel is: A. 40M/Min B. 250M/Min C. 500M/min D. none of the above 283. Cutting speed of carbide tools while cutting low carbon steel is: A. 40M/Min B. 250M/Min C. 500M/min D. 80M/Min 284. Straightness that can be achieved over a length of 300mm by grinding: a. 0.005-.01mm b. 0.1-0.2mm c. 0.05-0.1mm d. 0.5-0.8mm 285. The circularity achieved by finish turning on a standard centre lathe is: a. 0.005-0.008mm b. 0.0-0.08mm c. 0.1-0.2mm d. 0.2-0.3mm 286. Honing can correct: A. oviality B. taper C. straightness of bore D. axial curvature 287. Machine tool sliding surfaces are finish matched by: a. surface grinding b. fine milling c. slideway grinding d. scraping

288. Close sliding fit is given by: a. H7/g6 b. H7/h6 c. H7/p6 d. H7/k6 289. 60H6 can be achieved by: A. turning B. boring C. drilling D. internal grinding 290. The displacement accuracy which can be achieved on a jig boring machine is: A. 5/µm B. 50/µm C. 100/µm 291. Hardness values in cast iron can be measured in: A. shore b. BHN c. Rockwell d. None of the above 292. Auto collimator is used to measure: a. Dia upto 0.001mm b. Lengths c. Straightness d. Involutes error 293. Surface finish is measured by: a. Comparator b. Planograph c. Sprit level d. None of the above 294. The outside diameter of a 20 teeth 3 module gear is: a. 54 b. 60 c. 63 d. 70 295. Herring bone gear is used for: A. high speed transmission B. noise free transmission C. better load transmission D. none of the above 296. In a right angle transmission by helical gears, the hands of the helix of the gears are: A. same B. opposite C. immaterial D. none of the above 297. Worm drive is always self-locking: true or false 298. Most hydrostatic bearings normally work under: A. const flow system B. const pr system C. const temp system D. const vol system 299. Ball bearings are not generally used in crank shafts of automobiles because: A. of high cost B. of high speed C. cannot be assembled D. none of the above 300. Bronze is used in journal bearings essential to: a. reduce friction b. reduce heat c. eliminate oxidization d. eliminate seizing. 301. The spindle of high precision cylindrical grinder is mounted on: A. ball bearing B. taper roller bearing C. hydrostatic bronze bearing D. needle bearing 302. To accelerate the flow of gases: A. nozzle is used B. diffuser is used C. dia of pipe to be increased D. none of the above will help 303. Hydraulic accumulator: A. acts as an accumulator for dirt B. acts as storage of hydraulic energy C. acts as a pressure relief arrangement D. none of the above

304. When ice which is floating in water, melts, does the level of water: A. goes up B. goes down C. remain the same 305. Hammer blow in pipe happens due to: A. friction in pipes B. change in temperature C. stoppage of flow D. none of the above 306. Temperature rise in fluid flow causes: A. reduction in viscosity B. increase in viscosity C. no effect 307. Ratio between velocity of sound and velocity of any object is: A. prandtl number b. Reynolds number c. Avagadro’s number d. Mach number 308. Cavitation effect in flow occurs due to: a. Excess pressure b. Excess temperature c. Excess flow d. None of the above 309. In electrical locomotives ultimate transmission is by: a. AC motor b. DC shunt motor c. DC series motor d. Synchronous motor 310. Four beams of identical sections and lengths are made of cast iron, aluminium, steel and hardened steel. The beams are fixed at both ends, for a uniformly distributed load which will deflect least: a. Cast iron b. Aluminium c. Steel d. Hardened steel 311. Geneva mechanism is used for obtaining: a. Intermittent motion b. Accelerating motion c. Continuous motion d. None of the above. 312. Corioles component is associated with: a. Displacement b. Acceleration c. Velocity d. None of the above 313. Effect of increase of outside diameter of a helical compression spring on its rigidity is: a. Increased rigidity b. Decreased rigidity c. No effect d. Dry friction 314. Jominey curve is related to the study of: a. Hydraulics b. Thermodynamics c. Electrical d. None of the above 315. TTT diagram is used in: a. Surface finish b. Heat treatment c. Stress analysis d. Thermodynamics 316. Mehanite is the name given to a type of: a. Alloy steel b. Granite c. Nodular cast iron d. Cast iron 317. Unwanted impurity in molten aluminium is: a. Oxygen b. Carbon dioxide c. Nitrogen d. Hydrogen 318. Carburizing is done: A. For blackening of high carbon steel B. For case hardening of low carbon steel c. For post hardening process to reduce internal stresses d. To increase machinability of high tensile steels

318. Hardness in steel is as a result of: a. Martensitic structure b. Pearlitic structure c. Leduburetic structure d. Austenitic structure 320. Piston of an IC engine is made out of: a. Cast iron b. Steel casting c. Beryllium alloy d. Aluminum alloy 321. Montreal protocol limits the use of Ozone depleting substance 322. The crank shaft of a 300 HP IC engine is: a. Hot forged b. Shell moulded c. Cold forged d. Obtained through investment casting. 323. Rain drop is spherical due to Surface tension 324. Global warming is due to Carbon-di-oxide 325. One ton of refrigeration is equal to 12000 btu/hr 326. For a laminar flow Reynolds flow should be Less than 2000 327. In latent heating a substance changes phase without increase in temperature 328. Degree of saturation is ratio of _______? 329. A pipe friction test shows that, over the range of speeds used for the test, the non-dimensional friction factor f, varies inversely with Reynolds No. It can be inferred from above that, ans. Pipe should be smooth. 330. In a rough turbulent flow in a pipe, the friction factor would depend upon? Ans. Pipe diameter and pipe condition. 331. What is the refrigerant used in vapour absorption cycle? 332. Expansion in a vapour compression cycle is an Isenthalpic process 333. What is the work of throttling process? Ans. Expansion 334. What is the material of heat exchanger tubes? Ans. Copper 335. Tachometer is used to measure Speed 336. Mercury is used in manometer because ________? 337. Check valves are used to ensure unidirectional flow 338. Anti-freeze agent used is Ethylene glycol 339. Anemometer can be used to measure _________? 340. Bypass factor of a cooling coil is _________?

341. Aspect ratio of a rectangular duct is the ratio between its _______? 342. The temp that is numerically the same in Fahrenheit & centigrade scales is ________? 343. The loudness of sound depends upon its ________? 344. Dew point is the temperature at which water vapor will undergo ________? Ans. Condensation 345. In inductance _______ leads _______? 346. Power factor is least in ______? a. capacitance

b. resistance

c. inductance

347. Barometer is used to measure _______? 348. Identify the odd one out

a. DIN

b. ISI

c. JIS

d. IIT

349. If the NPSH requirements of a pump are not satisfied it wills _______? 350. Approach of a cooling tower is the difference between temperatures of ________? 351. A parallel flow heat exchanger will perform better than a counter flow heat exchanger. State whether this is true or false 352. The index that normally reflects laminar flow in a tube is ______? Ans. Reynolds no. 353. Pressure drop in air duct is influenced by __________? ans. Shape of the duct 354. By increasing the intake air temp, efficiency of IC engine will _______? Ans. decrease 355. The velocity of the sound depends on a. pitch b. quality and pitch c. loudness and quality and pitch d. none of the above 356. Theoretical correct air fuel ratio for petrol

a.6:1 b.9:1

c. 10:1

d. 15:1

357. The knock in diesel engine occurs A. instantaneous and rapid traverse of first part of the charge B.Reduction of the delay period C.instantaneous and auto ignition of the end part of the charge D.All the above 358. Ignion quality of the diesel fuel oil is measure by index no is called a. octane b. cetene c. calorific value d. carbon no 359. Carnot cycle maximum efficiency for A. reversible engine b. irreversible c. petrol d. diesel 360. Compressed air coming out of the punctured foot ball a. attains atm temp b.remains at same temp c.becomes cooler d.becomes hotter

361. The product of EI is a. flexural rigidity b.section modulus

c.polar modulus

d.modulus of rupture

362. Which of the following is the thin cylinder? a. boilers b.steam pipes c.water pipes d.all the above 363. Hoop stress induced in the thin cylinder by winding it with wire under tension will be a.0 b.tensile c.compressive d.shear 364. As compared to rivet joint to welded joint has ------ strength a.higher b.lesser c.either above d.none of the above 365. ------------ gear train is one in which each shaft call as one wheel only a.simple b.compound c.epicyclic d.none 366. In the clock ----------gear train is used to commonly minute to hour a.simple b.compound c.epicyclic d.none 367. If the earth shrinks by half the radius duration of one day A.4 hrs b.6 hrs c.12 hrs d.24 hrs 368. A tool used in cutting an external thread is called a. twist drill b.tap c.die d.end mill 369. In ----- moulding green sand is is generally used a. floor b. late c. bench d. it 370. With increase in cutting speed power requirement is a. decrease linearly b.remains constant c.increase linearly

d.Unpredictable.

371. What will be the locus of a point on a thread unwound from a cylinder? a. involute b. helix c. straight line d. circle 372. The ratio of no teeth to pitch circle diameter a. pitch b. circular pitch c. diametrical pitch d. module 373. Difference between dedendum and addendum is a. backless b.clearence c. flank d. tooth space 374. Compare to air craft air velocity in a rocket is a. 0 b. less c.more d. same 375. -------------is suitable for space travel a. turbo jet b. turbo prop c. rocket d. all the above 376. Rain drop is spherical due to A. surface tension B. specific weight C. specific gravity D. all of the above E. none of the above

377. By increasing the intake air temperature, efficiency of an IC engine will generally A. increases B.decreases C. remains the same D. increases at the beginning and then decreases gradually E. none of the above 378. A stone initially at rest is dropped from the edge of a very tall building. Taking acceleration as 10m/s2, what was the change in the speed of the stone during the 4th second? a. 10m/s b. 30m/s c. 15m/s d. 40m/s e. None of the above 379. What type of thread is used in lead screw of a lathe? A. acme thread B. V-thread C. square D. buttress E. none of the above 380. In latent heating, a substance involves _________ in phase with _________ in temperature. A. change, increase B. no change, increase C. change, no increase D. no change, no increase E. none of the above 381. For a cantilever beam with uniformly varying load, shape of bending moment curve is a) Parabolic b) hyperbolic c) Straight line d) cubic e) None of the above 382. Hammer blow in pipe happens due to a) Friction in pipes b) Change in temperature c) stoppage of flow d) All the above e) none 383. Which of the following statement(s) is/are true? a. A parallel flow heat exchanger will perform better than a counter flow heat exchanger b. Montreal protocol (1987) limits the use of ozone depleting substance c. Both (a) and (b) are true d. None of the above is true e. Data insufficient 384. The mercury does not wet with the glass. This is due to the property of the liquid known as a. Cohesion b. Adhesion c. Capillarity d. Surface tension e. both (a) and (b) 385. The increase in hardness due to cold working is known as A. age hardening b. work hardening c. induction hardening d. flame hardening e. none 386. Which of the following methods in welding uses a pool of molten metal? a. Carbon arc welding b. TIG welding c. Submerged arc welding d. MIG welding e. Thermit welding 387. A spark plug gap is kept between A. 0.3 to 0.7 mm B. 0.2 to 0.8 mm C. 0.4 to 0.9 mm D. 0.4 to 1 mm E. none 388. Which of the following fuel has little tendency towards detonation? a. Benzene b. Iso-octane c. N-heptane d. Alcohol e. None of the above 389. Which mechanical property a metal should possess to enable it to be mechanically formed? A. ductility b. malleability c. elasticity e. machinability e. None of the above 390. The strain energy stored in a spring, when subjected to maximum load, without suffering permanent distortion, is known as a. Strain energy b. Resilience c. Proof Resilience d. Proof stress e. None

391. How many of the following statements may be false? 1) The index that normally reflects the nature of flow in a duct is Reynolds number 2) One ton of refrigeration is equal to 12000 btu/hr 3) Pressure drop in air duct is influenced by shape of the duct 4) The viscosity of hydrogen increase with increase of temperature A. One only b. Two only c. Three only d. All the above e. None of the above 392. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base is __________ than that passing through its C.G. and parallel to the base. a. Nine times b. six times c. four times d. one-half e. one-third 393. A hydrometer is used to measure a. velocity of fluids b. velocity of gases c. flow of fluids d. specific gravity of fluids e. none of these 394. Which law states that change in internal energy of a perfect gas is directly proportional to the change in temperature? a. Avagadro’s law b. Gay-Lussac law c. Joule’s law d. Newtonian law e. None of these 395. A taper provided on the pattern for its easy and clean withdrawal from the mould is known as A. machining allowance b. draft allowance c. shrinkage allowance d. distortion allowance e. None of the above. 396. Hygrometry deals with moisture content in air 397. 1 kg-m =9.81 J 398. Relation between gauge, abs atm pressures 399. Work-study deals with 400. Time study deals with 401. Expand MIS-Management Information System 402. CPM and PERT deals with determining the status of the project 403. To avoid cavitation in a centrifugal pump inlet pressure should be high 404. Expand NTP- Normal temperature and pressure 405. Dalton’s law of pressure total pressure equals sum of partial pressures. 406. As per Avogadro’s hypothesis molecular wt of all gases occupy the same volume under same conditions of temp and pressure 407. Use of intercooler- to reduce work input. 408. Use of after cooler to reduce volume of receiver.

409. Water hammer occurs due to sudden obstruction in flow. 410. ABC analysis deals with 411. Main objective behind plant layout is A. to avoid back tracking b. To minimize the space occupied 412. Efficiency of diesel engine as compared to petrol engine under same rated load (high) 413. Which of the following is not present in a CI engine? a. Fuel injector b. Carburetor c. Fuel pump 414. Which of the following is not present in a SI engine a. Spark plug b. Carburetor c. Fuel injector 415. Pour point is (min temp at which a liquid flows at set condition) 416. Zeroth law of thermodynamics 417. In value engg “value” means---------420. Second law of thermodynamics deals with entropy 421. Mach no deals with-----422. Output=9kW, Input=30kW, Efficiency=? 30% 423. Overall hear transfer co-eff. Present in a) Conduction b) Convection c) Conduction and convection d) All modes of heat transfer. 424. Orifice Definition provision for flow of liquid with regulation 425. Break even point no profit and no loss 426. If a block of ice floating in a tub of water and gets melted then what will be the level of water a. falls down b.rises c. remains the same 427. Compressed air coming out of a punctured football A) Remains at the same temperature B) becomes hotter C) becomes cooler 428. Heat transfer takes place as per a) Second law b) First law c) Zeroth law 429. Choking in compressor means change in mass flow rate with proportional to Pr ratio, change in mass flow rate with inversely proportional to Pr ratio, fixed mass flow rate regardless to Pr. 430. Formation of frost in refrigerator a) Can be prevented if design is proper b) Heat transfer becomes more c) Heat loss d) Immaterial.

431. Supercharging is the process of increasing the density of the inlet charge. 432. How will you find the unburnt mixture in exhaust gas? a) Analyzing CO b) Analyzing Oxygen. 433. Compression ratio is the ratio of a) Delivery pr.to inlet pr. b) Inlet pr to delivery pr. c) Stroke volume to clearance volume 434. To reduce moisture troubles the compressor main should be a) Vertical b) Horizontal c) Slanting 435. Critical activity is a) Zero float b) High float c) Low float 436. Cash discounts is based on a) Sold on credit b) Bargaining capacity of the seller c) Payment of instant cash 437. 1 kW-hr=3600 kJ. 438. Which process is more effective for compression? a) Isothermal b) Adiabatic c) Polytrophic 439. What did W.H. Taylor do? 440. An adiabatic compression is one in which no heat enters or leaves the system. 441. What happens if the refrigerator doors are kept open? The room will be warmed up gradually. 442. In break even analysis, profit occurs when sales revenue >total cost. 443. In which device, the temp of the refrigerant is the lowest a) Compressor b) Condenser c) Expansion valve

d) Evaporator

444. A material piece weighs 2.5 kg in air and 3 kg, when immersed in water, then sp.gr is 445. A body of sp.gr 7 is immersed in mercury of sp.gr 13.6. What percent of the body will be immersed in water? 0.515. 446. 1 tonne of refrigeration is the cooling effect produced when melting one tonne of ice 447. Unit of power Watt. 448. What is the use of the reverse flow of air in compressor? a) Cleaning the dust particles settled b) Velocity of the air flow increases c) pressure increases 449. Rota meter – Flow measurement 450. If we use petrol in diesel engine lot of fuel will remain unburnt. 451. In V belt drive contact is made on a) bottom b) sides c)bottom and sides

452. The intake of air in an air compressor can be had from a) An area nearby coal yard. b) An area nearby a cooling tower. c) A room in which conditioned air is maintained at 20°C. d) Atm air maintained at 1°C 453. Section modulus of hollow shaft PI/32*(D4-d4)/D 454. Down milling is also called ___________? Climb milling 455. Drilling is an example of ____________? Oblique cutting 456. Section view of ’C’ washer___________? 457. Deflection of simple supported beam carrying UDL _________? 5/384*WL^4/EI 458. Flexible coupling is used because 459. Washer is used to provide ________________? Bearing area 460. Initial tension is considered in 1) Tension springs 2) Compression springs 3) Both 461. Kelvin plank law deals with 1) Conservation of work into heat 2) conservation of heat into work 462. Soldering alloy consists of __________? Tin and lead 463. Why chromium is used in steel alloys? Corrosive resistance 464. High cutting speed is obtained while machining 1) HSS 2) carbide 3) CBN 465. Metal forming is an example of _____________? chipless machining 466. Top rake angle is provided for______________? Easy removal of chip 467. Alloying is done for increased strength and application 468. Why transformer is used in welding 1) to convert AC to AC 2) AC to DC 3) DC to AC 469. Spherical cast iron is getting from Grey cast iron by adding _________? Mg 470. In throttling process Enthalpy__________? constant 471. 70 cc of engine means____________? Swept volume 472. Geneva mechanism is used for______________? Intermittent motion 473. In NC system for profile machining 1) Point to point 2) contour motion 3) paraxial motion. 474. In centreless grinding, the grinding wheel and the regulating wheels rotate in the same direction.

475. Centridal distance of a semi circle 4*r/3*pi 476. Highest packing factor: FCC 477. Which chart takes care of control attributes: P chart, C chart, R chart 478. Fixture is used for holding the work piece without disturbing the tool path 479. Code for circular interpolation G 02 480. Order of transmission in a car: EFCPD (Engine Flywheel Clutch Propeller shaft Differential) 481. Reverse gear has less speed because 1. More speed is not necessary in reverse gear 2.Steering is difficult in the reverse direction 3.less space availability 4. Design simplification 482. Use of annealing: _____________? To relieve stresses 483. Pulley question: w=f/2 484. Equivalent stiffness of springs in series: k1k2 / (k1+ k2) 485. Deflection=5 mm. stiffness=k. then applied load is 5 k 486. Bevel gear is used in differential. 487. Which of the following uses consumable electrodes? MIG. 488. Alloy used in the manufacture of surgical instruments. Martensitic stainless steel (Chromium steel) 489. Uses of superconductors. 490. What path does double slider crank mechanism follows. (Check if it is Elliptical). 491. Ratio between Brake horse powers to the energy supplied. Brake thermal efficiency 492. Two emfs E1 and E2 are given. Among two lengths one is given. Be clear with the relation between ratios of emfs to the lengths across. 493. What is anodizing? 494. What is honing? 495. What is hermoplastic? 496. The value of pressure used in elec resistance welding 2KN 497. Up milling opposite direction

498. Down milling same direction 499. Pump in sewage lobe pump 500. Pump in oil gear pump 501. Heat transfer based on which the law second law. 502. Sum using thermal coefficient of exp to fin stress 503. Critical speed of a shaft is affected by Span of the shaft 504. Starting friction is low in 505. Heat transfer is based on which law (zeroth, first, 2nd, kirchoff) 506. In refrigeration where will temp be max? Between compress and condenser 507. Stoichiometric AF ratio is chemically correct mixture by efficiency. 508. How will u compute performance of diesel eng? bsfc 509. How will u pump sewage water i.e. which pump? Lobe pump 510. How will u pump viscous fluid? Gear pump 511. Honing process: Surface finish 512. If thread angle is increased (mechanical adv decreases) 513. Principal plane condition :( shear stress 0, normal stress max) 514. If refrigerator is opened in a room, fan is also on. What will happen to room temp? Temp increases. 515. Graft in casting 516. How will u improve resistance? 517. Magnetic compass indicates a) true north pole b) anionic earth pole c) geographic north pole d) magnetic north pole. 518. For a cantilever beam with uniformly varying load, shape of bending moment curve is a)parabolic b) hyperbolic c) straight line d) cubic. 519. For perfectly elastic bodies, coefficient of restitution is a) 0 b) 0.5 c) 1 d) infinity. 520. For 1st order lever, mechanical advantage is

a) 1 c) =1 d) none.

521. 18:4:1 in H.S.S represent a) 18tu : 4vn : 1 cr. Other choices r just interchanged. 522. Due to intense braking of an automobile reaction of wheels on road A. Will be equally distributed to all 4 wheels. B. Will be more at rear wheels C. Inertia will be on the front wheels. D. Not remember. 523. Thermal efficiency of I.C engines will be a)20-25% b)30-35% c)60-75% d) 45- 55%. 524. when a mass is supported by spring of spring constant k, which is cut in 4 equal pieces and the connected in parallel way the equilent spring constant is a)k/4 b) 16k c) 64k d) k. 525. when a mass is supported on roof of a elevator and elevator moves with an acceleration of 4.9 m/s2 shows a spring reading of 15kg, then the weight of the body is a) 10 b) 15 c) 30 d)20. 526. Mass production of bolts and rivets is by a .hot extrusion b .forging c .cold heading d .cold peening 527. why doesn’t mercury stick to glass tube a .cohesive force>adhesive force b .cohesive force80

b. 90 d. >110

530. If a body weighing 40kg floats in water with 40% of volume immersed, the sp.gravity of the body is a. 1 b. 0.16 c. 0.25 d. 531. Axial claw clutches a. Disengages b. engages c. engages only with load d. operates only with load 532. If center distance of a involutes mating gear changes then the pressure angle a. Increases b. decreases c. remains unaltered 533. Normalising is A. heated above critical temp and cooled in air. B. C. heated below critical temp and cooled in air

heated above critical temp and quenched in oil

535. The best suited material for permanent magnet a. Alnico b. silicon 536. Hooke’s joint is used for A. parallel and intersecting shafts C. nonparallel and intersecting

B. non parallel non intersecting D. parallel and non intersecting

537. To have a const.velocity ratio the two gears should have (or) angular velocity of the gear will remain the same if the .......... cuts the line joining ........ at a fixed point law of gearing 538. Which of the following is a loose running fit 539. Fahrenheit and centigrade are equal at

a. h6f6 b.h6e6 c. h6d6

a.-40 b.0 c. 32 d.100

540. M10 hexagonal bolt is manufactured a. upset forging and thread rolling b. Casting and thread rolling 541. Specific speed in a turbo machine depends on a. geometric shape, b. size, c. head, d. all the above. 542. Unit of surface roughness is a.micron, b. PPM, c. mm2 d. meter 543. Mohr’s circle is used to find 544. Storage, transportation, operation, delay, inspection symbols are used in A. process chart, b. mam m/c chart, c. grant chart, d. all the above. 545. Melting point of ice changes with a. increase with pressure, b. increase with pressure ratio. 546. If the speed of fan is doubled, quantity of air displaced is a. doubled, b.4times, c.1/2 times d. remains same. 547. Which has less carbon content? A. tool steel, b. spring steel, carburising steel, forging steel. 548. When a helical compressive spring is subjected to axial compression load, the stress induced in the spring will be a. tensile, b. compressive, c. shear. d. none 549. For a bar element if area, length, and stress are doubled the elastic strain energy will be A. Half b. doubled c. 4 times d. 8 times 550. For a punching die, 2mm thick sheet, dia. D, force f, the shear force is 8800. 551. Spheroidising is a process of A. annealing b. normalizing c. tempering d. case hardening 552. What type of thread is used in lead screw of a lathe A. acme thread B. V C. Square D. buttress 553. Wear allowance of a go nogo end plug gauge is given for a.. go end

b. nogo end

554. Internal spur gears can be made by using a. Gear shaping b. slotting c. Gear hobbing 555. Height of the capillary varies with A. Increase with increase in dia of tube B. increase with increase in sp. weight C. increase with decrease in dia D. increase with decrease in sp. weight 556. A bolt of nominal diameter 33mm the stress of 100N/mm2 the safe load is A) 60 KN b) 100 KN c) 160 kN. 557. A cylinder with in 1% of the tolerence capacity limit, the permissible tolerence in height and radius are is 0.2% radius and 0.25 height. 558. In ball bearings cage is used for a. to maintain the ball position b) to maintain parallelism between inner and outer race.

559. Pumped storage plants are used mainly for A. High head b) run off river. 560. For an incompressible solid, poisson’s ratio is 561. Distance of ozone layer from surface of earth a. 0 to 100 km b 20 to 50 km c. 50 to 100 km d. 10 to 15 km 562. An elevator is moving up with an acc. of 4.9 m/sec2 a body weighing 15 kg is attached with spring balance. What is the value in the spring balance a. 10 b. 15 c. 20 d. 30 563. At same heat input and max pressure A. efficiency of otto cycle more than diesel B. efficiency of dual cycle more than diesel C. efficiency of diesel cycle more than otto 564. Bending stress is (y is the distance from the neutral axis) A. inversely proportional to y b. proportional to y c. independent of y 565. If the body is 40% immersed in water what will be its specific gravity 566. The temp at the three edges of a square shaped body is 0 C and on the fourth edge is 100 c find the Temp at the centre of the square a. 25 b. 100 c. 50 d. 0. 567. Machine tool drives are generally given in: a) Arithmetic progression b) geometric progression c) Harmonic progression d) none of the above 568. Finite element analysis is used in a) Accurate measurement b) stress analysis c) Metallurgy 569. Coolant is generally not used while machining a) low carbon steel b) high carbon steel c) cast iron

d) none of the above

d) alloy steel

570. Machinability of steel is improved by the presence of a) nickel b) tungsten c) sulphur d) chromium 571. Negative rake angle a) increases cutting force d) none of the above

b) decreases cutting force

572. The hardest tool material used is a) Coated carbide b) high speed steel

c) no effect on cutting force

c) boron nitride

573. Stick slip phenomenon is associated with a) Spindle rotation b) belt drives c) slide movement

d) diamond

d) none of the above

574. Gear hobbing is a) Shaping process b) generating process c) forming process

575. Cutting speed of H.S.S tools while cutting low carbon steel a) 40m/min b) 250m/min c) 500m/min d) none 576. Cutting speed of carbide tools while cutting low carbon steel a) 40m/min b) 250m/min c) 500m/min d) 80m/min 577. Straightness that can be achieved over a length of 300mm by grinding a) 0.005 -0.01mm b) 0.1-0.2mm c) 0.05-0.1mm d) 0.5-0.8mm 578. The circularity that can be achieved by finish turning on a standard centre lathe is a) 0.005-0.008mm b) 0.0-0.08mm c) 0.1-0.2mm d) 0.2-0.3mm 579. Honing can correct a) oviality

b) taper

C) Straightness of bore

d) axial curvature

580. Machine tool sliding surfaces are finish matched by a) surface grinding b)fine milling c) slide way grinding

d)scraping

581. Close sliding fit is given by a) H7/g6 b) H7/h6

c) H9/p6

d) H7/k6

582. 60H6 can be achieved by a) Turning b) boring

c) Drilling

d) internal grinding

583. The displacement accuracy which can be achieved on a jig boring machine a) 5/µm b) 50/µm c) 100/µm 584. Hardness value in cast iron can be measured in a) shore b)BHN c)Rockwell

d)none

585. Auto collimator is used to measure a) dia upto 0.001mm b) lengths c) straightness

d) Involutes error

586. Surface finish is measured by a) comparator b) planograph

d) none

c) sprit level

587. The outside diameter of a 20 teeth 3 module gear is a) 54 b) 60 c) 63 d) 70 588. Herring bone gear is used for a) High speed transmission b) noise free transmission c) Better load transmission d) none 589. In a right angle transmission by helical gears, the hands of the helix of the gears are a) Same b) opposite c) Immaterial d) none 590. Worm drive is always self-locking

a) True

b) false

591. Ball bearings are not generally used in crank shafts of automobiles because a) of high cost b)of high speed c)cannot be assembled d)none

592. Most hydrostatic bearings normally work under a) Constant flow system b) constant pressure system c) Constant temperature system d) constant volume system 593. Bronze is used in journal bearings essential to a) Reduce friction b) reduce heat c) Eliminate oxidization

d) eliminate seizing

594. The spindle of high precision cylindrical grinder is mounted on a) Ball bearing b) Taper roller bearing c) Hydrostatic bronze bearing d) needle bearing 595. To accelerate the flow of gases a) nozzle is used b) diffuser is used c) dia of pipe to increased

d) none of these will help

596. Hydraulic accumulator a) Acts as an accumulator b) acts as a storage for hydraulic energy c) Acts as a pressure relief d) none 597. When ice which is floating in water, melts, does the level to water a) go up b) go down c) remain the same. 598. Hammer blow in pipe happens due to a) friction in pipes b) change in temperature

c) stoppage of flow

599. Temperature rise in fluid flow causes a) reduction in viscosity b) increase in viscosity

c) no effect

600. Ratio between velocity of sound and velocity of any object is a) prandtl number b) Reynolds number c) Avagadro’s number 601. Cavitation effect in flow occurs due to a) Excess pressure b) excess temperature

d) none

d) mach number

c) excess flow

602. In electrical locomotives ultimate transmission is by a) AC Motor b) DC Shunt Motor c) DC Series Motor 603. Geneva mechanism is used for obtaining a) Intermittent motion b) accelerating motion

d) none

d) Synchronous motor

c) continuous motion

604. Corioles component is associated with a) Displacement b) acceleration c) velocity

d) none

d) none

605. Effect of increase of outside diameter of a helical compression spring on its rigidity is a) Increased rigidity b) decreased rigidity c) no effect d) dry friction 606. Jominey curve is related to the study of a) Hydraulics b) thermodynamics c) electrical 607. TTT diagram is used in a) Surface finish b) heat treatment

d) none

c) stress analysis

d) thermodynamics

608. Mehanite is the name given to a type of a) Alloy steel b) granite c) nodular cast iron

d) cast iron

609. Unwanted impurity in molten aluminium is a) oxygen b) carbon dioxide c) nitrogen

d) hydrogen

610. Hardness in steel is a s a result of a) martensitic structure b) pearlitic structure c) leduburetic structure d) austenitic structure 611. Carburising is done a) For blackening of high carbon steel b) for case hardening of low carbon steel c) For hardening process to reduce internal stresses d) to increase machinability of high tensile steels 612. Piston of an IC engine is made out of a) cast iron b)steel casting c)beryllium alloy

post

d)aluminium alloy

613. The crank shaft of a 300 HP IC engine is a) hot forged b) shell moulded c) cold forged d) obtained through investment casting 614. A 6kg ball is suspended from two wires of equal length. The angle between the wires is 90 degrees. What is the tension in each wire? a. 58.8N b. 41.6N c. 29.4N d. 83.2N 615. A 523 kg experimental rocked sted can be accelerated from rest to 1602 km/h in 1.82s. What net force is required? a. 4.6X106N B. 4.6X105N C. 1.6X106N D. 1.3X105N 616. A force that averages 984N is applied to a 0.42kg steel ball moving at 13.8 m/s by a collision that lasts 0.027s. If the force is in a direction opposite to the initial velocity of the ball, what is the final speed of the ball? A. 77.1m/s B. 63.3m/s C. 13.8m/s D. 49.5m/s 617. A stone initially at rest is dropped over the edge of a very tall building. Taking g as 10m/s2, what was the change in the speed of the stone building during the 4th second? A. 10m/s B. 30m/s C. 15m/s D. 40m/s 618. How long will it take a 2000w motor to lift a 320kg container vertically upwards for 26m? (g = 9.8 m/s2) A. 29s B. 6.3s C. 4.2s D. 4.1s 619. A collision between two isolated items will in generally conserve A. the total kinetic energy and the total momentum of the system. B. the total kinetic energy but not the total momentum of the system. C. the total momentum but not the total kinetic energy of the system. D. the momentum of each object. 620. What is the force exerted on a submarine window of 2m2 area, if the submarine is at a depth of 2km below the surface?(the density of sea water is 1.03X103 kg/m3) A. 4.04X107N B. 4.04X104N C. 2.02X104N D. 2.02X107N 621. A body partially floats with 2/3rds of its volume under the surface of a fluid. If the density of the fluid is X kg/m3, what is the density of the body? A. 3/2 X kg/m3 B. 2/3 X kg/m3 C. 14.7 X kg/m3 D. 0.15 X kg/m3

622. How many of the following statements are true: A. the buoyant force on a body depends on the shape of the body B. The buoyant force on a body always acts in the same direction C. the buoyant force on a body depends on the mass of the body D. The buoyant force on a body depends on the density of the fluid surrounding the body A. only one B. only two C. only three D. only four 623. How many of the following statements may be false? A. The pressure in a fluid depends on the density of the fluid. B. The forces due to pressure in a fluid act perpendicular to the surface of a body immersed in a fluid. C. The buoyant force experienced by a body immersed in a fluid depends on the density of the body D. The buoyant force always acts vertically upwards on a body immersed in a fluid A. Only one B. Only two C. Only three D. All four 624. How many atoms are present in a mole of CH4? (Avagadro’s number = 6.023X1023 /mole) A. 1.2X1024 B. 3.01X1024 C. 1.2X1023 D. 6.023X1023 625. A power station generates 500MW of power and exhausts 800MW as waste heat into the environment. What is the efficiency of the power station? A. 61.5% B. 38.5% C. 62.5% D. 23% 626. How long does it take a 350W coffeepot to boil of 0.7L of water initially at 100°C. The latent heat of vapourisation of water = 2.1X106 J/kg. A. 6.1 min. B. 7.0 min C. 3.9 min. D. 3.1 min. 627. A 16 ohm resistor and 8 ohm resistor are connected in series across a 12V battery. What is the voltage across each resistor respectively? A. 8V , 4V B. 4V , 8V C. 12V, 12V D. 6V, 6V 628. How many of the following statements regarding sound are true? A. Intensity depends on the square root of the amplitude B. Loudness only depends on the intensity of a sound C. The pitch of a sound depends on the frequency D. Sound is reflected whenever a change in acoustic impedance is encountered A. Only one B. Only two C. Only three D. All four 629. How many of the following statements regarding light are true? A. Light travels in a straight line even when it crosses between two media of different refractive index B. Infrared light has longer wavelength than ultra-violet light C. Light can behave both like a ray and like a particle D. It is possible to get a real image with a concave lenses A. Only one B. Only two C. Only three D. All four 630. The pressure p in terms of its mean kinetic energy/unit volume E is a .E/3 b.E/2 c.3E/4 d.2E/3 e.5E/4 631. Convert volumetric to gravitational, relative volume of each constituent of flue gas a. %mw b. xmv c. me d. xsw e. %sw

632. Which is correct for reversible polytrophic process? a. temperature constant b. density constant c. volume constant d. entropy constant e. same heat transfer 633. If a gas or vapour allowed to expand through a minute hole a. free expansion b. hyperbolic c. adiabatic expansion d. parabolic e. throttling 634. Minimum work of compressor is possible, when the adiabatic index is a.0.75 b.1 c.1.27 d.1.35 e.2 635. Under ideal condition, isothermal, isochoric, adiabatic and isobaric are a. static b. dynamic c. quan-static d. stable e. thermodynamic 636. If a heat engine attains 100% efficiency, then it is A. Zeroth law b. I law c. II law d. no

e. all

637. If Q1 is the heat in source, Q2 is the cold sink for heat pump then COP a. Q1 / (Q1- Q2) b. Q2 / (Q1- Q2) c. (Q1- Q2) / Q1 638. The output of diesel engine is increased if a. more fuel b. flywheel size c. incoming air

d. scavenging

e. supercharging

639. Accumulation of carbon in the cylinder increases when a. decrease in volume b. volumetric efficiency c. ignition time d. effective compression ratio e. travel time 640. for same power, same speed, flywheel of petrol and diesel engine are a. smaller b. greater c. equal d. none 641. If petrol is used in diesel engine, then a. higher knocking b. black smoke

c. lot of fuel

d. improper combustion.

642. Reciprocating compressor is used for a. large quantity of air at high pressure b. large quantity of air at low pressure c. low quantity of air at low pressure d . low quantity of air at high pressure 643. Lean relation for

a. specific gravity

b. dynamic viscosity

644. Centre of pressure = centre of gravity when 645. Vortex on whirlpool is due to

a. cavitation

b. wake

c. drag

646. What it is Rupture? 647. A belt drive, where pulley dia is double, and then it key length must be a. doubled b. same c. increase the critical length 648. Surface contact in motion is called a. roll pair b. surface pair c. lower pair

d. slide

649. For fluctuating load----------- is used a. ball bearing b. roll bearing c. thrust bearing

d. sleeve bearing

650. In pinion and gear design, the design must be made by

a. gear b. pinion c. both

651. The plate is severely deformed at a side then it grains becomes a. ductile b. malleable 652. What is recrystallation temperature? 653. What is austempering? 654. Acetylene is staid on --------- form 655. Tool life is concentrated on

a. liquid

a. cutting speed

b. solid

c. compressed

b. material c. feed or depth

656. Reamer is used for 657. In an ideal gas compared to a real gas at very high pressure occupies? 658. Kinetic theory of gases assumes that collisions between the molecules are? 659. The condition of perfect vacuum that is at absolute zero pressure can be attained at? 660. Specific heat of air? 661. Which law states that internal energy is function of Temperature? 662. Minimum work done for an adiabatic process the value of n? 663. Air Refrigerator works on? 664. When crude oil heated Which Hydro carbon comes first? 665. What is the purpose of Supercharger? 666. 1Kg of carbon to CO, Amount oxygen required? 667. Horse power per tones of refrigeration? 668. Scale formation on the surface of the boiler tubes due to? 669. Axial shift in steam turbine occurs due to? 670. Latent heat of vaporization at low pressure and temperature? 671. Shaft revolving in a bearing which pair? 672. Difference between dedendum and addendum?

673. The fatigue life of a part can be improved by? 674. Rotational tendency of force? 675. The frequency of transverse vibration is 3 Hz then critical speed? 676. Advantage of V belt? 677. In gear boxes which type of key is used 678. A structural member subjected to an axial compressive force is called? 679. Pig iron is produced in which furnace? 680. Heat generation of arc welding is due to? 681. In what angle does an object thrown height will travel the longest distance? 682. Angle of contact between the journal and bearing? 683. The coupling is required to connect two parallel shaft distance between the shaft is small and variable? 684. Carbon is added to steel to increase its hardness-True/False 685. Wings of airplane are made by Stretch forming 686. To protect from thrust which type of follower is used? Roller follower/mushroom or spherical follower. 687. With increase in temperature--- Viscosity of liquid--- Decreases 688. Heavy machine beds are made of CI for Vibration Damping 689. For shock resistance and vibrations we use malleable cast iron. 690. Rupture strength Load/Neck area. 691. Washer is used for increasing bearing area. 692. Surface endurance limit depends on surface finish 693. In a uniformly distributed load of 6n/m over a 5 meter length simply supported beam, the value of B.M at the point where shear force is zero (17.5/22.5/55/75) 694. Cam size depends on (base circle/pitch circle/prime circle/none) 695. Poisons ratio is higher in (rubber/steel/wood)

696. In drill tool carbon % is (